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한윤구(Han, Yoon-Ku),정수진(Chong, Su-Jin),임계재(Lim, Gye-Jae) 한국정보전자통신기술학회 2008 한국정보전자통신기술학회논문지 Vol.1 No.2
In this paper, we develop the Hipass antenna that is used in electronic tall-gate charging (ETC) system in Korea expressway. This antenna has circular polarized characteristics, and especially has 45 degree tilted beam properties. These properties are very effective in ETC communication between the vehicle antenna and the tall-gate antenna. To achieve these properties on a small microstrip type antenna structure, we propose a annular ring microstrip antenna with stubs. When the length and angle of stubs are changed, the direction of the circular polarized beam is generally tilted by in elevation angle. Especially, by using the stubs in inner area or outer area of ring antenna, it is found that the beam direction of in azimuth angle can be rotated.
복강경하 담낭 절제술 시행 시 예방적 항생제 사용에 대한 전향적 분석
한윤구(Yoon Gu Han),김익희(Ick Hee Kim),문기명(Gi Myoung Mun),김준현(Jun Hyun Kim),황국성(Guk Seong Hwang) 한국간담췌외과학회 2008 한국간담췌외과학회지 Vol.12 No.4
Purpose: We wanted to clinically evaluate the antibiotic therapy used from pre- to postlaparoscopic cholecystectomy along with the improved surgical techniques and instruments and the patient nutrition. Methods: We prospective studied 105 patients who were treated with laparoscopic cholecystectomy for acute and chronic cholecystitis at Busan St. Mary Hospital from March 2007 to January 2008. The two groups were divided as follows: (A) the group was not injected with antibiotics, and the other group (B) was injected with antibiotics. We did not used antibiotics when the patient had no acute aggravating symptoms, and we exclude the patients with old age (>70 years), a past history of diabetes mellitus (DM) or hypertension (HTN), and a past operation history. Results: Between the two group, there was no difference when they were compared for age, BMI (Body Mass Index), the operation time (minute) and the length of the hospital stay: (A) Group 49.3±13.0 years, 24.4±3.2 kg/m2, 37.9 ±10.0 minute and 4.6 ±1.3 days, respectively, and (B) Group 55.9±15.6 years, 23.5±3.5 kg/m2, 43.2 ±23.8 minute and 5.5 ±2.5 days, respectively. There was a significant different in the leukocyte count and the % of neutrophils: (A) Group 6396㎕-1 and 53.4%, respectively and (B) Group 9354㎕-1 and 66.6%, respectively. In (B) group, there were 2 cases of atrial fibrillation, 1 case of diarrhea and 1 case of wound seroma. There were no surgical related complications in group (A). Conclusion: For the well nourished chronic cholecystitis patients, the use of the prophylatic antibiotics may be less effective because of the many drug-induced side effects. More studies about the use of prophylactic antibiotics are needed.
황계호(Gye-Ho Hwang),변경범(Kyung-Beom Byun),임영태(Young-Tae Lim),한기수(Ki-Su Hab),한윤구(Yun-Goo Han),김순기(Soon-Ki Kim),이봉섭(Bong-Seob Lee) 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
As for the research direction of existing household electric range, research on efficiency increase and electricity consumption through resonant circuit configuration was conducted. In recent years, the research direction of household electric range is being actively researched to apply the user’s convenience. Therefore, this paper confirms the applicability of a circuit configuration with a remote(Wifi) control function added for user convenience for eco-friendly household electric ranges. In the future, the disabled and the elderly plan to test whether the proposed device can be controlled remotely.